diane. >> thank you very much, steve. i was watching you, lonni, director of the african-american history of the smithsonian, the museum and what were you thinking as you watched those freedom riders. >> what i realized is that there is so much that we learn from people like that and the challenge in america is that often we are historical and so for me part of what president obama's speech does, part of what quite candidly museums like mine do is ensure that americans remember because when they remember the work of freedom riders like that, they remember that change is possible. they remember that whatever your age you can make america better and they remember that the challenge is to make america always be america. >> what's the single most important exhibit or thing, artifact that you have in the museum? what's the one that evokes the most emotional response? >> well, it's interesting, joan mulholland who you just interviewed actually donated to us shards of glass from the stained glass windows that were blown out when